poe power auto-neg enable
Function
The poe power auto-neg enable command enables power auto-negotiation for interfaces.
The undo poe power auto-neg enable command disables power auto-negotiation for interfaces.
By default, power auto-negotiation is disabled for interfaces.
Among PoE models, only the S5731-H, S5731-S, S5731S-S, S5735-L, S5735S-L, S5735S-L-M, S5735-S, S5735-S-I, S5720-12TP-PWR-LI-AC, S5720-28TP-PWR-LI-AC, S5720-28TP-PWR-LI-ACL, S5720-28P-PWR-LI-AC, S5720-52P-PWR-LI-AC, S5720-28X-PWR-LI-AC, S5720-28X-PWR-LI-ACF, S5720-52X-PWR-LI-AC, S5720-52X-PWR-LI-ACF, S5720S-12TP-PWR-LI-AC, S5720S-28TP-PWR-LI-ACL, S5720S-28P-PWR-LI-AC, S5720S-52P-PWR-LI-AC, S5720S-28X-PWR-LI-AC, and S5720S-52X-PWR-LI-AC support this command.
Usage Guidelines
Usage Scenario
By default, the switch supplies power to the APs connected to interfaces in compliance with IEEE 802.3at (the maximum output power is 30 W). Some APs support both IEEE 802.3at and 802.3af. The switch can supply power to these APs in accordance with IEEE 802.3af (the maximum output power is 15.4 W). When the APs connected to the switch support both IEEE 802.3at and 802.3af, enable power auto-negotiation on the interfaces connected to these APs. When the total available power of the switch is less than 30 W and the switch detects that the current power supply standards of an AP are IEEE 802.3at, the switch can send an LLDP packet to the AP to enable the AP to set its power supply standards to IEEE 802.3af. Power auto-negotiation changes only the power supply standards of APs but not the interfaces to which the APs are connected.
Enabling power auto-negotiation on interfaces will change the power supply standards of the APs connected to the interfaces, reduce the power consumption of the APs, and enable the switch to supply power to more APs when the rated output power of the switch is fixed.
Precautions
- The lldp dot3-tlv power 802.1ab force command is mutually exclusive with the lldp dot3-tlv power 802.3at command and cannot be configured together.
- Only AP6050 and AP4051TNN support power auto-negotiation.
- When the total available power of the switch is less than 30 W, the power supply standards of all the APs connected to the interfaces that have power auto-negotiation enabled will be set to IEEE 802.3af. When the total available power of the switch is more than the larger value of 60 W and reserved power, the power supply standards of the APs connected to the interfaces will be restored to IEEE 802.3at based on the power supply priority configured on the interfaces. That is, the power supply standards of the AP connected to the interface with a higher priority are restored to IEEE 802.3at. If the power supply priority of these interfaces is the same, the power supply standards of the AP connected to the interface with a smaller interface number are restored to IEEE 802.3at first.
- Disabling power auto-negotiation on an interface will restore the power supply standards of the AP connected to the interface to IEEE 802.3at. This operation will power off the APs connected to some interfaces if the total power of the switch is insufficient.
Example
<HUAWEI> system-view [HUAWEI] interface gigabitethernet 0/0/1 [HUAWEI-GigabitEthernet0/0/1] poe power auto-neg enable Warning: This operation will enable PoE power auto-negotiation of the port, which will change the power-up mode of the PD connected to the port from AT to AF in case of insufficient power. Continue?[Y/N]:y